Materials Literature
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A synthesis route to ordered mesoporous carbons with controllable nitrogen content has been developed for high-performance EDLC electrodes. Nitrogen-doped ordered mesoporous carbons (denoted as NMC) were prepared by carbonizing a mixture of two different carbon sources within the mesoporous silica designated by KIT-6.…
The electrical transport and magnetoresistance properties of the polycrystalline La 0.67 Ca 0.33 MnO 3 film produced on a Pyrex substrate were investigated for the first time. X-ray powder diffraction indicated that the film sample has a perovskite structure. Scanning electron microscope indicated that La 0.67 Ca 0.33…
The photoredox reaction of ferrioxalate after 266/267 nm excitation in the charge transfer band has been studied by means of ultrafast extended X-ray absorption fine structure (EXAFS) analysis, optical transient spectroscopy, and quantum chemistry calculations. The Fe-O bond length changes combined with the transient…
Although ceramics have been known to mankind literally for millennia, research has never ceased. Apart from the classic uses as a bulk material in pottery, construction, and decoration, the latter half of the twentieth century saw an explosive growth of application fields, such as electrical and thermal insulators, we…
Abstract The effects of natural (MT) and organically modified (O‐MT) montmorillonite clays on the properties of polydimethylsiloxane (PDMS) rubber were evaluated. Rubber composites with different clay contents were prepared by a compounding procedure in an open two‐roll mill, which was followed by a compression‐moldin…
This report demonstrates a synthetic route for ordering a set of Au nanoparticles on the vertically aligned conducting polymer (polypyrrole) for the superhydrophobic surfaces with low water flow friction. It demonstrates how one can use polymer nanorod pillars and a variety of Au nanoparticles to generate controlled s…
A model is presented that describes nonstationary solidification of binary melts or solutions from a cooled boundary maintained at a time-dependent temperature. Heat and mass transfer processes are described on the basis of the principles of a mushy layer, which divides pure solid material and a liquid phase. Nonlinea…
Bulk Cu 2 O or cuprite is the only stable copper(I) compound present in plentiful amount in earth's crust. It is a challenging job to take bulk Cu 2 O to a nanoregime and to stabilize it in solution. No wonder that Cu 2 O in its nanoregime would act as a photocatalyst. We report a new synthetic protocol for the first…
The relationship between the crystal structures, band structures, and electronic properties of acene-TCNQ complexes has been investigated. We focus on the newly synthesized crystals of the charge-transfer salt tetracene-TCNQ and similar to it perylene-TCNQ, potentially interesting for realization of ambipolar transpor…
The cell wall in Gram-negative bacteria is surrounded by an outer membrane comprised of charged lipopolysaccharide (LPS) molecules that prevent entry of hydrophobic agents into the cell and protect the bacterium from many antibiotics. The hydrophobic anchor of LPS is lipid A, the biosynthesis of which is essential for…
The functionalization of the internal surface of pure-silica MFI zeolite using aliphatic alcohols (1-butanol and 1-hexanol) is reported. Calcined MFI nanoparticles (50, 100, 200, and 500 nm in size) are treated with neat 1-butanol and 1-hexanol under reflux conditions. The 1-butanol loadings on 200 and 500 nm particle…
Large-scale highly oriented ZnO nanorod arrays were directly grown on zinc foil through a simple hydrothermal reaction of Zn foil with aqueous ammonia at 100 °C. The products were characterized with X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. It was found that the ZnO nanorod…
Abstract The dielectric constant, dielectric loss factor, and alternating‐current conductivity of Gd‐doped poly(vinyl alcohol) (PVA) samples have been studied in the temperature and frequency ranges of 290–450 K and 50–5 × 10 6 Hz, respectively. Three relaxation processes—α a , α c , and ρ—have been obtained. The firs…
Nanocomposites built by intercalation of negatively charged Ni hydroxy citrate species [Ni(C 6 O 7 H 3 ) x (OH)] y y (3 x −1)− and NiCl 4 2− guest entities in the interlayer space of host Mg/Al layered double hydroxides (LDHs) have been obtained by anionic exchange. The sizes of the Ni particles in the Ni/Mg(Al)O samp…
Abstract VO x , CrO x and MnO x supported on TiO 2 are all efficient catalysts in the total oxidation of benzene. However, in the oxidation of chlorobenzene, they exhibit different behaviors in terms of their resistance to deactivation by the chlorinated reactant and/or products of the reaction (Cl 2 , HCl). Precisely…
Spinning strands: A hydrogel fiber made entirely of DNA without any covalent cross-links, composed of intertwined toroid entanglements of flexible DNA strands (see scheme), was prepared by a one-step wet-spinning method with a hydrophilic ionic liquid as the condensing agent and coagulation solvent. The internal struc…
Here we reveal that enzyme specific activity can be increased substantially by changing the protein loading density (P(LD)) in functionalized nanoporous supports so that the enzyme immobilization efficiency (I(e), defined as the ratio of the specific activity of the immobilized enzyme to the specific activity of the f…
The aging of a charged colloidal system has been studied by small-angle x-ray scattering, in the exchanged momentum range Q=0.03-5 nm(-1) , and by dynamic light scattering, at different clay concentrations (C(w)=0.6-2.8%) . The static structure factor S(Q) has been determined as a function of both aging time and conce…
In this study, we have investigated the photochemical properties and photodynamic effects of ruthenium phthalocyanine (RuPc(CO)(Py)) and naphthalocyanine (RuNc(CO)(Py)) complexes. When a nanosecond-pulsed laser is used, the photodecarbonylation of our Ru complexes efficiently proceeds via stepwise two-photon excitatio…
High-frequency electron paramagnetic resonance (HFEPR) data are presented for four closely related tetranuclear Ni(II) complexes, [Ni(hmp)(MeOH)Cl]4.H2O (1a), [Ni(hmp)(MeOH)Br]4.H2O (1b), [Ni(hmp)(EtOH)Cl]4.H2O (2), and [Ni(hmp)(dmb)Cl]4 (3) (where hmp(-) is the anion of 2-hydroxymethylpyridine and dmb is 3,3'-dimethy…